The amount of turn isn't the point, but in case the previous response (from anymouse) causes confusion I'm not sure what is meant by "the most characteristic version" but the amount of turn achieved in the chart forms of the natural and reverse turn is one whole turn for each figure. This is good technique and is the amount of turn expected in examination. Of course the natural turn is underturned at the corner but not "around the short side" or any other side. One could achieve a sort of arc by dancing three naturals in succession, the first and last each cutting a corner. Cutting corners as a matter of course is frowned upon by examiners, however.